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    14.素養(4)
1 如圖所示電路,若v ( t )=121.2 cos (1000t )V,i ( t )=12.12 sin(1000t )A,則下列何者正確? 109 統測
A Z 為電阻,其值為10 Ω
B Z 為電容,其值為100 μF
C Z 為電感,其值為10mH
D Z 為電容,其值為10 μF

v ( t )=121.2 cos (1000t )V = 121.2 sin (1000t +90°)V

i ( t )=12.12 sin(1000t )A 電流落後90°,負載為電感 Z = XL = 121.2/12.12=10Ω

ω=1000,XL = ωL,L = 10/1000 = 10mH